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Will you please provide here the IIST entrance exam Chemistry Solved Paper? The IIST entrance exam Chemistry questions are below: Which one of the following is the correct statement? i. Chlorides of both beryllium and aluminium have bridged chloride structures in solid phase. ii. B2H6.2NH3 is known as 'inorganic benzene'. iii. Boric acid is a protonic acid. iv. Beryllium exhibits coordination number of six. The pKa of a weak acid, HA is 4.80. The pKb of a weak base, BOH, is 4.78. The pH of an aqueous solution of the corresponding salt, BA, will be i. 7.01 ii. 9.22 iii. 9.58 iv. 4.79 Amount of oxalic acid present in a solution can be determined by its titration with KMnO4solution in the presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl i. reduces permanganate to Mn2+. ii. oxidises oxalic acid to carbon dioxide and water. iii. gets oxidised by oxalic acid to chlorine. iv. furnishes H+ ions in addition to those from oxalic acid. Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is i. R2SiCl2 ii. R3SiCl iii. R4Si iv. RSiCl3 Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly? i. Metal sulphides are less stable than the corresponding oxides. ii. CO2is more volatile than CS2. iii. Metal sulphides are thermodynamically more stable than CS2. iv. CO2is thermodynamically more stable than CS2. Phenol, when it first reacts with concentrated sulphuric acid and then with concentrated nitric acid, gives i. p-nitrophenol ii. nitrobenzene iii. 2,4,6-trinitrobenzene iv. o-nitrophenol ![]() ![]() ![]() ![]() For detailed paper here is attachment: Last edited by Aakashd; March 6th, 2020 at 10:12 AM. |